Thermo-fluid flow behavior of the IN718 molten pool in the laser directed energy deposition process under magnetic field

Zhou，Yang1,2; Qu，Wenying2,5; Zhou，Fan2; Li，Xinggang3; Song，Lijun4; Zhu，Qiang2,5

2022

10.1108/RPJ-05-2022-0143

RAPID PROTOTYPING JOURNAL   Impact Factor & Quartile

1355-2546

Purpose: This paper aims to understand the magnetohydrodynamics (MHD) mechanism in the molten pool under different modes of magnetic field. The comparison focuses on the Lorenz force excitation and its effect on the melt flow and solidification parameters, intending to obtain practical references for the design of magnetic field-assisted laser directed energy deposition (L-DED) equipment. Design/methodology/approach: A three-dimensional transient multi-physical model, coupled with MHD and thermodynamic, was established. The dimension and microstructure of the molten pool under a 0T magnetic field was used as a benchmark for accuracy verification. The interaction between the melt flow and the Lorenz force is compared under a static magnetic field in the X-, Y- and Z-directions, and also an oscillating and alternating magnetic field. Findings: The numerical results indicate that the chaotic fluctuation of melt flow trends to stable under the magnetostatic field, while a periodically oscillating melt flow could be obtained by applying a nonstatic magnetic field. The Y and Z directional applied magnetostatic field shows the effective damping effect, while the two nonstatic magnetic fields discussed in this paper have almost the same effect on melt flow. Since the heat transfer inside the molten pool is dominated by convection, the application of a magnetic field has a limited effect on the temperature gradient and solidification rate at the solidification interface due to the convection mode of melt flow is still Marangoni convection. Originality/value: This work provided a deeper understanding of the interaction mechanism between the magnetic field and melt flow inside the molten pool, and provided practical references for magnetic field-assisted L-DED equipment design.

Magnetohydrodynamics Numerical simulation Solidification Thermo-fluid flow

SCI

English

Corresponding

WOS:000866072000001

ENGINEERING

2-s2.0-85139665085

Scopus

1.School of Mechatronics Engineering,Harbin Institute of Technology,Harbin,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,China
3.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,China
4.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha,China
5.Shenzhen Key Laboratory for Additive Manufacturing of High-Performance,Southern University of Science and Technology,Shenzhen,China

Zhou，Yang,Qu，Wenying,Zhou，Fan,et al. Thermo-fluid flow behavior of the IN718 molten pool in the laser directed energy deposition process under magnetic field[J]. RAPID PROTOTYPING JOURNAL,2022.

Zhou，Yang,Qu，Wenying,Zhou，Fan,Li，Xinggang,Song，Lijun,&Zhu，Qiang.(2022).Thermo-fluid flow behavior of the IN718 molten pool in the laser directed energy deposition process under magnetic field.RAPID PROTOTYPING JOURNAL.

Zhou，Yang,et al."Thermo-fluid flow behavior of the IN718 molten pool in the laser directed energy deposition process under magnetic field".RAPID PROTOTYPING JOURNAL (2022).